Electric dental furnace.



PATBNTBD MAY 8, 1906.

1). G. STEINEOKE, DEGD.

S. & W. STEINEGKB, ADMINISTRATORS.

ELECTRIC DENT-AL FURNACE;

APPLICATION FILED MAY 23, 1905.

' 2 SHEETS-SHEET 1.

5% I d w fi.

ATTORNEYS A I INVE/V T03 Jamel (2}. zeznecl e 2 SHEETSSHBBT 2.

PATENTED MAY 8, 1906 NOE 820,025.

D. G. STEINEOKE, DEOD.

F3. l}: W. STEINEGKE, ADMINISTRATORS.

ELECTRIC DENTAL FURNACE.

APPLIQATION FILED MAY 23, 1905- fi gi/z z/v f 34 .51 yJZZfi /L I DANIELG. STEINECKE, OF NEW YORK, .N. Y.; SAMUEL STEINECKE AND A UNITED STATESPATENT OFFICE.

WILLIAM STEINECKE- ADMINISTRATORS OF SAID DANIEL G. STEIN- ECKE,DECEASED.

ELECTRIC DENTAL FURNACE.

Specification of Letters Patent.

Patented May 8, 1906.

Application filed May 23,1905. Serial No- 26l,783;

'a citizen. of the United States, residing at New York, in the county ofNew York and State of New York, have invented certain new and usefulImprovements in Electric Dental Furnaces, of which the following is aspecification, such as will enable those skilled in the art to which itappertains to make and use the same.

This invention relates to electric dental furnaces, and is animprovement on that specifically known as the Hammond electric furnace;and the object of this invention is to provide a dental furnace, ashereinafter described andclaimed, in which porcelain inlays or dentalwork of otherkinds and classes may be brought to a high degree oftempera ture for baking or, other similar purposes, a further objectbeing to provide an electric furnace of this class in which the muffleis composed of two parts and is readily detachable from the furnaceproper, and a still further object being to provide a mulfleforfurnacesof this class the two parts of which may be electrically energizedsingly or together. The invention is fully disclosed in the followingspecification, which the accompanying drawings form a part, in which theseparate parts of my improvement are designated by suitable referencecharacters in each of the views, and in which- D Figure l is a frontelevation of an electric dental furnace constructed according to myinvention; .Fig. 2, a plan view thereof on the line 2 2 of Fig. 1 andshowing diagrammatically a method of electrical connection; Fig. 3, apartial section oh the line 3 3 of ,Fig. 1 and showing the mechanicalconstruction of my muffle; Fig; 4,a section of the furnace proper, takenon the line 4 4. of Fig. 3; Fig. 5, a view similar to Fig. 4, but takenon theline 5 5 of Fig. 3 and Fig. 6;.a detail view of the muflie which Iemploy v i 1 In the drawings formingpart ofthis speci fication I haveshown a casing (7;,provided with a non-conductive top I), said top beingcomposed of slate, marble, or other similar and suitable material, andmounted on the top I) and at one side thereof is a furnace casing c,which is secured to the top I) by able-manner.

Pivotally mounted on the top shown at b is a rheostat-arm 5 adapted tomeans of screws, bolts, or in any other suit-v and as engage one of aplurality of contacts bf, connected in the usual manner by means ofresistance-coils, said resistance-coils bein shown at b in Fig. l andbeing indicated diagrammatically at b in Fig. 2 and adjacent to therheostat-arm b is a knife-switch 11 which is in permanent communicationwith a binding-post b to which one Wire of a main electric circuit isadapted to be connected, and the spring-contactsof the knife-switch arein electrical communication with the rheostatarm 6 through theresistance by means of an electrical conductor 1)".

The furnace 0 comprises two vertical members c and'c which are connectedwith each other by means of a horizontal casing 0, open at its top, andresting-in the upper open end of the casing c is a cylinder 0 which isfilled with refractory material, as shown at c, said cylinder 0", aswell as the material 0 therein, extending entirely from one member 0 tothe other member 0 of the furnace, and the refrac'tory material, asshown at c, is of the form known as fire-brick and closely engages thecylinder 0 at the ends thereof; but in practice I prefer to provide anair-space 0 between the cylinder 0 and the fire-brickc,

. vided with an opening e, which registers with the opening 0 in thefire-brick c, and said opening (3 is adapted to be closed by means of apivoted cover 6 provided with a peep-hole e, and said pivoted cover 6when in a closed position, rests on a shelf 6 formed -on the frontmember 0 of the furnace, and by meansof this construction it will beseenthat the mufHe a may be withdrawn from the opening 0 through theopening 6 whenever desired.

"The mufile d, asclearly shown inv Fig. 6, is comprised of an uppermember (1 and a lower member (1 the lower edges of thesegmentally-formed upper member (1 being formed to engage the upperedges of the horizontallyranging member (Z and the members 01 and d ofthemufiied are each provided with inof ll rods g ,,mouiitcd then showndiagrammatically the electrical con 2 scopes dependent windings ofconductive material, through. the hottoiii memb as shown at d and (1respectively, the ends (1, and member is accord igly heated.

of the Winding (I being provided With. tcr- Ininzil plates d and (i7,and the ends-of the Winding {Z being provided with terminal plates d andd, as clearly shown. in Figs. 4 and 5.

Adjacent to and adapted to make contact with. the terminal plates d andd", as shown in Fig. 4, is terminal plate 6 which is con nectcd to acontact e, secured in the firehrick c by means of an; electricalconductor 6 and mounted in the filtFllIlGli c at points adapted to makecontact with the terminal plates (Z and d" are tcrininsl piste-s e anda, which are in. elect cal connection with contsictsf and. hy n'iccns ofelect coi1- ductors f and 5;", respectively, and the co11- teats e, 7,sndf are i: ated from. the cg linder 0, in which they are mounted, bymeans of the fire-hricl-z or refractory i'nctcrisl c, and it Willhe by:nczms of this construction that when the motile d is 'tion for use thetorwerd terminals of are both in elm contact a, Whereas the rearwardterminals wini'lings {1}? in electrical comimion. with innlopsndentcontacts, respec tivcly.

Mounted on the top I) of the casing a and. possingthrrmgh the casing 0ot the furnace c are three tithes g, (1 ind g, in each of which is a rodg", which nsulated from the tubes g, 9 and c, cleci'hr shown in thedrawings, and the rods 9 are each pro ided. with contacts at their nppei.nds, the contacts 9 of the rod g in the t he ginnlzing electricalconnection with the c-x i act (2, whereas the con-- tacts g of the rod:g i the tubes 9 and g are in electrical connection with the contacts fand f .rcscccti 01y, Wl'ienthccylinder c is in position.

in Fig. 2 ot the drawings 1 have shown the tubes g, 5 and g inv section,as Well the in, and I have also nections oi the parts justdcscrihcd, andalso in electrical co ninunice-lion. with the contactg of tho tuhcv 5 aswitch lzgwhich is sdsptod to make elect ical connection with the contact g of the tube by means of a. terminal it, and. the switch it is incommunication. with a. hinding-post h" by means of an electricalconductor hi, and said. himlingqiost serves as the electrical connectionfor the other Wire of the main electric circuit, and it will-ho seenthat when the parts are in the positions shown in. Fig. 2 the currentfrom the binding-post b tln'ough the knife-snitch b rheostat andrheostet-orm 1)", rod. 9' of the tube g through the Winding (Z to thecontact 9 of the tube (7 and thence to the switch 1 through theelectrical conductor hto the hinclinsspost h and the circuit iscompleted.

When the switch it is moved to the left into engagement with theterminal 72?, the current passes as just described and also passesthrough the winding (1 to the contact 9 of the tube g and thence to theterminal 71 and through the switch i and. to the binding-post h, End theupper member 61* of the muttlc is thereby heated, and it will he thatthe switch. 7: therefor controls the energizing of the winding d of theupper member a"? of the motile, it being frequc itly nec ssary oradvisable in the making of porcelain inlays to have all the hea t at thebottom thereof, but none shove the same, as it is been found that betterresults are prod v in this manner than when both the upper and lowersurfaces of thejmut'llcs heated.

t will also be seen that the .nmiile (Z nniy he removed from the l'iehri k c at any time for s :hstitution or rsnsir, eno. it tln- Wiring; atany time should nrojoot through the inner surface of the muthc all that.is necessary is to remove the some, separate the mcmhvrs other changesin and modifications of the construction herein. described may be madeWithout clepeitine' tr 1). the spirit of my invention or sacrificing itsadvantages.

Having fully described my invention, what I claim new, and desire tosccurc h Lev ters Patent, is

1. In a furnace, at base having electric contacts forming terminals ofen electric oircuit, standards secured to the hose, :1 casing oven atits top hctwccn said standards, a meta. cylinder resting in the open endof said casing, said cylinder being filled with retractory material sndsaid refractory material bein" provided with a central opening, a mu .ein said central opening and an electric heating-circuit inthe Walls ofsaid motile and terminating in electric contacts to complete the circuitwith. the source of clectricity of melting electrical connection withthe said electric contsc s of the case, SLlJStQ. s ly as shown anddescribcd.

2. In a furnace of the class. described, a base, contacts formingterminals 09 an electric circuit on said. base, vertical standards onsaid lasso, a casing o enst its to and conmeeting said stands]: s, anoven 0 refractory material res sing in the open end of said citsing anelectric hee.ti1 1g-circuit arranged in said oven and in. electricalcornmunicetion with said. lncls of said. electric circa-Fit,suhstcntiolly own and. described.

d of the muffle 6 3. In a furnace, a base, vertica "standards securedthereto, a casing open at its-top and V connectingsaid standards,acylinder filled with refractorymaterial resting in the open topofbaidpasing, said refractory material being provided with a centralsegmental opening, a mufiie detachably mountedinsaid opening, saidmufiie being composed of an upper and lower member, an electricheatingcircuit arranged in the walls of said upper member, an electricheating-circuit arranged in the walls of said lower member, and meansfor energizing said electric heating-circuits,

' substantially as show'hand described.

4. In a furnace, abase, vertical standards secured thereto, a casingopen at its .top and connecting said standards, a cylinder filled withrefractory material resting in the open top of said casing, saidrefractory material being provided with a central segmental opening, amuffle detachably mounted in said opening, saidmufile-being composed ofan upper and lower member, an electric heatingcircuit arranged in thewalls of said upper member, an electric heating-circuit arranged in thewalls of said lower member, and means for energizing said electricheating-circuits independently of each other, substantially as shown anddescribed.

5. A heater, comprising a muflie composed of two detachably-connectedparts, an electric heatin -circuit in the Walls of one of said parts, anectric heating-circuit in the walls of the other of said parts, andmeans for energizing said circuits independently of .each

other, substantially as shown and described.

6. In a furnace, amufiie composed of an upper and lower member, anelectric heatingcircuitarranged in the'walls of the upper of saidmembers, an electric heating-circuit formed in the walls of the lower ofsaid members, the terminals of said electric heatingcircuits beingconnected at one end "and being provided with independent contacts atthe 8. An electric heating-furnace provided with a mufile composed ofseparatedetachable top and-bottom parts, having-independ-l ent circuits,substantially as shown and de scribed.

9. An" electric heatingiurnace with a mufie com osed of top an parts,and means or heating either orboth of said parts separately,substantially as shown and described.

rovided bottom In testimony that I claim' the foregoing as I myinvention I have signed my name, in pres' ence of the subscribingwitnesses this 18th day ofMay, 1905.

DANIEL G. STEINECKE Witnesses:

F. A. STEWART, O. J. KLEIN.

